Ludwig Wittgenstein

Ludwig was born in Austria and did 
alot of work in the field of modern
philosophy.  His main basis was on 
that of logic and foundations of 
language.
He is said to be one of the most 
influential philosophers of his 
time.  He has written many publications
on philosophy, logic, and language.
http://en.wikipedia.org/wiki/Ludwig_Wittgenstein#Important_publications